Method and device for the mechanical production of multiple walled paper bags



March '14, 1939' M ER 2,150,275

METHOD AND DEVICE FOR THE MECHANICAL PRODUCTION OF MULTIPLE WALLED PAPER BAGS Filed Jan. 6, 193'? 2 sheets sheet 1 1g 2 fig. 2 l 45' I 1 March 141939. GQDER METHOD AND DEVICE FOR THE MECHANICAL PRODUCTION OF MULTIPLE WALLED PAPER BAGS Filed Jan. 6, 193'? 2 Sheets-Sheet 2 flnvantor:

Patented Mar. 14, 1939 shaping the bag, and severed so that the severed- METHOD AND DEVICE FOR THE ivnzonan- ICAL PRODUCTION OF MULTIPLE WALLED PAPER BAGS Max Goder, Neuss-on-the-Rhine, Germany Application January 6, 1937, Serial No. 119,351 In Germany January 10, 1936 9 Claims.

This invention relates to a method and a device for the walled paper mechanical production of multiplebags with cross bottom or block bottoms, with reinforced mouth in which the tube forming the bag is formed by approaching paper webs to be unwound from rolls, and has for itsobject the simplification and acceleration in the production of the above mentioned paper bags.

The main feature of the invention is, that the paper webs are unwound from rolls in a transverse direction to the side folds to be made. for

sheets are fed to the subsequent operating stations with their side edges stepped in the direction of feed and this stepped position is preserved after the sheets have been superimposed. By this method of shaping the bag it is not only possible to obtain a quick continuous production, but to cause on the one hand the mouth edge of the shaped blank to lie in a direction which assists this continuous production and on the other.

hand a simplification for carrying out the method and at the same time to increase the output.

After the paper webs have been superimposed the creasing for the side and bottom folds and the gumming of the side flaps take place followed by the folding and gumming of the side A flaps, and the subsequent folding transversely to the direction of feed, stickingand tube formation, whereupon the portion of the tube necessary for forming into square the bottom is opened and brought shape, the gumming, folding and sticking of the cross bottom taking place continuously.

The sheet producing the wrapper is, according to the invention, besides being stepped with respect to the side edges of the two superimposed sheets whose side edges are stepped with respect to each other is also stepped with respect to the transverse edges of the sheets, so that a projecting edge strip is produced at one of the transverse edges which, after having been folded over, reinforces the mouth of the bag;

The reinforcement of the mouth can, according to the invention, also be effected by feeding to the superposed sheets a narrow edge strip to be also pulled off a roll and this strip is stuck onto the sheets. The

edge strip projects slightly beyond the flush edge of the sheets, so that it can be folded over.

The printing of the roll often does not allow perfect and uniform application of printing ink during the printing of a whole roll owing to the lack of possibility of observation during the continuous unin terrupted feed. Periodical observation of the printing of the roll is certainly possible by repeatedly stopping the machine during the printing operation. This stopping of the machine, however, prolongs the working time and does not enable a continual observation of the print.

According to the invention, therefore, the application of the wrapping sheet can be carried out by feeding to the superimposed sheets which may be stepped at the side verse edges, as desired, a per taken from a pile in feed and by sticking this as well as at the transsheet serving as wrapthe same direction of wrapper sheet on the superimposed sheets. The wrapper sheetis fed with the severed superimposed sheets in such 'a manner that, besides being stepped in the direction of feed i. e. at the side edges of the sheets,

the front and rear 1. e., transverse edges of they wrapper are stepped relatively to the corresponding edges of the webs pulled off the rolls.

Machines are known, in which the-wrapper sheet is fed to a paper sheet severed from a web, or a wrapper from a pile is brought on to the superimposed sheets. do not allow the wrapper These machines, however,

taken from the pile to be stepped both longitudinally and transversely.

The superimposed sheets are conveyed in longitudinal direction through the machine so that the mouth of the bag leads.

The wrapper sheet is fed at right angles to the direction in which the superimposed sheets are fed.

The sheets separated from the web are then placed on the wrapper and the wrapper part is folded over or pressed on by means of levers and rams. It is not possible'to step the front edges of the paper layer fed from the web.

A machine for carrying out the method according, to the invention comprises a sucker for taking the wrapper sheets which convey the wrapper from a pile and rollers sheets to stops against which the severed and superimposed sheets are also fed to unite with the wrapper sheets. At the joint where the superimposed and wrapper'sheets are brought together a folding device is arranged forfolding and pressing on the projecting parts of the wrapper sheet serving as reinforcement for the mouth.

For raising the end of forming the bottom, a bott the tube necessary for om lifter and a sucking cylinder gripping and lowering the front fold edge and a suction slide bottom part are provided,

for lowering the rear which slide acts upon the said bottom part until it is formed into a square shape.

The tube end formed into a bottom is, according to the invention, provided with a cover sheet. .An embodiment of the invention is illustrated by way of example, in the accompanying drawings in which:---

Fig. 1 shows in plan view a portion of the three webs from which the sheets to be superimposed and the wrapper sheet are severed, the severing means or blades being supposed to be so arranged that the side edges of the severed sheets are stepped.

Fig. 2 shows the two superimposed sheets with their stepped side edges after they have been severed from the web to form a bag, tine wrapper sheetstepped with respect to the stepped side edges and to the flush transverse edges of the two sheets.

Fig. 3 shows in dotted lines the folds for the sides and the bottom of the bag.

Fig. 4 shows the position of paste strips on the stepped side edges at one side of the sheets and the wrapper, and the folding of the side edges at the other side. i

Fig. 5 shows the paper tube formed by the sheets and the wrapper.

Fig. 6 shows the position of paste strips on the bottom portion of the tube.

Fig. 7 shows the finished bag.

Fig. 8 shows the feeding of a narrow additional strip for reinforcing the bag mouth. I

Fig. 9 shows in plan view the position of the narrow additional strip.

Fig. 10 shows a device for severing sheets from three webs.

Fig. 11 is a diagrammatic view of a machine in which the wrapper sheet is taken from a pile and,

together with the two superimposed inner sheets, is folded into a bag. I

Fig. 12 is aplan view of the device for feeding the wrapper to the superimposed sheets.

Figs. 13 and 14 show respectively, the wrapper sheet with its reinforcing strip ready for folding down, and after the strip has been folded down.

- the arrow,

Figs. 15 to 17 are side elevations of the device for forming the tube in different positions.

Figs. 18 and 19 are side elevations oithe device for forming the cross bottom.

Fig. 1 shows a web i from which the wrapper I, Fig. 2, is severed, and two webs 2' and 3' from which the superimposed sheets 2 and 3 are severed, respectively. This can be done by a device 33, 33', and 33" are provided and equipped with sheets 2, and 3 from the respective webs 2, and'3' in stepped relation. The severed sheets are fed in such a manner that the paper sheets are stepped at their front and rear side edges as shown in Fig. 2. The steps extend transverseliito the direction of the feed which is supposed to be from the left to the right in Fig. 1, as indicated by an'dalso transverselyto the side folds 8 and 3, (Fig. 3) to be carried out to-form the bag.

" In Fig. 2, the transverse edges of the 'two superimposed sheets; 2 and 3 areflush and'only the wrapper shee'tl is stepped to form a projecting strip v4 at one of the" transverse edges but it is understood that the transverse edges of the sheets 2-and 3 may. also be stepped, if desired. The

-length of the sheets 2 and 3 is equal tothe developed bag width. When the sheets I, 2', 3 have been stuck together, the strip 4 of the sheet destined to produce the reinforcement of the mouth, is folded over'and'pressed tightly on to the sticking stripe 5 by a suitable device after this (Fig. 6).

against stops 31. During this operation sheet I as illustrated in Fig. 10 where staggered cylinders stripe has been applied. The creases 6 (Fig. 3) for the bottom folds and the creases i, 3 (Fig. 3) for the side folds are then produced. Hereupon the front side fold 3 (Fig. 4) is formed and the stepped sheet ends it, ii, l2 of the wrapper and 5 of the inner 2, 3 (Fig. 4) are gummed whereupon the second side fold is made and the tube formed, both the wrapper and also the inner sheets i and 2 being separately stuck on one another. The tube thus formed is then fed with the tube openings M, i5 positioned transversely-to the direction of feed, the tube part it v (Fig. 5) necessary for the bottom being opened or formed into square shape Hereupon paste I1 is applied on the bottom (Fig. 6) to enable the bottom points |8, |3 15 (Fig. 7) to be folded over and stuck on one another. According to Figs. 8 and 9 the reinforcement of the mouth is not efiected by the wrapper. In this instance a narrow additional strip 20, which is likewise pulled ofl a roll 23, is fed to the paper webs 2', and 3 here arranged in opposite sequence to that shown in the other figures forming the inner sheets 2, 3 and the wrapper and stuck onto the latter, so that a reinforcement of the bag mouth is produced.-

The reinforcing strip 4 is preferably cut according to Figs. 2 and 3 in such a manner that at the corresponding transverse edges of the sheets 2 and 3 the strip is set back from the stepped rear side edges whereas at the other side it projects beyond the stepped front edges.

In the-machine for carrying out the invention illustrated-in Figs. ll to 19 the production takes place in the following manner:

The paper webs 2| and 22 corresponding to the Twebs 2' and 3 of the previous figures are unwound from supply rolls and guided over rollers 23 and 24 respectively. The paper web 22 (Fig. 11) is provided with paste for example by means of the 40 pasting cylinder 25 which receives paste from the rollers 26 and 2'|-of the paste box 28. As counterv bearing for the pasting cylinder a cylinder 23 is provided. The two paper webs 2| and 22 are then severed by devices such as 33' 34' and 33", 34" in 45 Fig. 10, and the severed sheets 2 and 3 enter between a pair of rollers 30 and 3| which deliver them to other pairs of feeding rollers 30', 3|, and 3.0", 3|", and finally the sheets are conducted position shown, in dotted lines and conducts the sheet between the cylinders 43 and 44. A pasting roller 45 imparts a coat of paste to the cylinder 44 for the strip of pastel on the projecting strip 4 of the wrapper sheet (Figs. 2 and 12) which serves for reinforcing the bag mouth, as described. The pasting'roller takes its paste from the rollers 41 and 43 of the paste box 48.. then conducted by the rollers 43 and the endless bands 50 against the stops 5|. When the two inner sheets 2- and 3 severed from the paper webs 2| and 22 and the "wrapper sheet have been brought together in stepped relation, as described 70 with the wrapper sheet underneath, the strip 4 (Fig. 13) is folded over by means of folding flaps 52 (Fig. 12) These folding fiapsare actuated by v bevel gears 53. The inner and wrapper sheets (Fig. 14) are thus stuck toget These stuck I! The wrapper is 55 sheets are then gripped by the movable grippers 54 -of'the cylinder 55 and of the counter cylinder 56 and fed on. Sinkable folding blades 56 and 51 are arranged in the cylinder 55 and resilient clamping and folding bars 59 and 60 in the cylinder 58. As soon as the paper sheets come between the cylinders 55 and 58 the unit will'be pressed at a predetermined folding point into and held in the clamping and folding bar 59 by the folding blade 51 (Fig. 15) so that the now raised sheet portion 6| (Fig. 15) is folded over when passing the folding cylinder 62. This makes the first side fold 8. The portion of the sheet destined to receive the second fold 9'is then pressed into and held in the clamping and folding bar 60 by the folding blade 56. The first folding bar 59 then liberates the unit as soon as it has arrived under the cylinder 63 (Fig. 16). The forward portion 64 .of the unit slides over the guide bars 65 Whereas the rear sheet portion which is still between the cylinders 63 and 58 is provided with paste by the pasting roller 66 which receives its paste from the paste box 69 through the intermediary of rollers 61 and 68. The rear portion of the sheet is held by the clamping and folding bars 60 until the paper, changing its direction of movement, is formed into a tube, that is in forming the second fold between the cylinders 58 and 10 (Fig. 11) the direction of movement changes in so far that the front folded edge now becomes the rear folded edge. The tube, after being shaped and stuck by the cylinders 50 and I (Fig. 11), passes over the guides ii between the rollers l2, 13, M, '15. In passing through these rollers the creases for the bottom square are produced by the creasing blades '16. The tube then passes between the rollers 71,18, and 80 and the tube end in which the bottom forming has to take place is raised by the bottom lifter 0! of the roller 8 in such a manner that it stands at right angles to the surface of the tube. The front fold edge b of the tube end 0 moving ahead slides into the angle guide piece 82 (Fig. 18) against the suction cylinder 83 by which it is sucked on through the suction holes 8 3 and, during the rotation ofthe cylinder 03, is held by this cylinder, laid down and formed to square shape. The portion which is net gripped by the cylinder 83 is gripped by the suction slide 85 and laid down in the following manner. As soon as the front fold edge b of the tube end 0 is gripped by the suction holes M of the cylinder 03 the suction slide movable towards the point of contact between the cylinders 83 and 06,

jumps forward, grips the rear fold edge 81 of the tube edge 0 and presses it down. The'suction slide 85 (Fig. 19) subsequently remains in its lowered position until the incision d has arrived under the cylinder 63 under which the bottom square is folded. The workpiece then travels between the cylinders 88, 89, 9, 0|, 02 and 93,the bottom points of the bottom shaped to a square bag provided with paste by the roller 90 to which paste is fed from the paste box 91 by the rollers 95' When passing between the cylinders 08;

-from the pile I 04 and moves in to the position shown in dotted lines. The individual sheets are here sucked by suction air by the suction holes I05 of the cylinder I06 and released by the sucker I03. During the rotation of the cylinder I06 the sur face of the sheet is pasted by the pasting roller I01 to which the paste is supplied from the paste box I I0 by'the rollers I06 and I09. The work piece on coming out from between the cylinders I00 and IM encounters the cover sheet held and pasted by the cylinder I06 so that the two parts (cover sheet and cross bottom) are stuck together between the rollers I06 and III, the suction holes I05 release the cover sheet. The finished article is conveyed by the rollers I06 and III over the guides II2 between the bands H3 and II4 which are wound around rollers H5, H6 and H1, H8. The work pieces are again pressed by these bands to improve the sticking and then collect in a pile I20 on the table H9.

I claim:

1. A machine for mechanically producing multiple walled 'paper bags with cross or block bottoms, comprising in combination a sucker adapted to remove a wrapper sheet from a pile, rollers adapted to receive said wrapper sheet from said sucker, stops. adapted to arrest the movement of said sheet, means for feeding a plurality of superposed webs, means for cutting said webs into sheets, means for guiding said sheets against said stops on the top of said wrapper sheet, and means.

. for uniting said blanks with said wrapper sheet.

2. In a machine as specified in claim 1, a folding device at the point where said sheets and said wrapper are united, adapted to fold over and press a projecting portion of said wrapper sheet to form a reinforcement of the bag mouth.

3. In a machine as specified in claim 1, means for forming sheets and said wrapper sheet into a tube, a bottom lifter adapted to raise one end of said tube to form a bottom, a suction cylinder adapted to grip and press down the front folded edge of said tube, and a suction slide adapted to press down the rear edge of the bottom'part of said tube and to form said bottom into square shape.

4. In a machine as specified in claim 1, means for forming sheets and said wrapper sheet into a tube, a bottom lifter adapted to raise one end of said tube to form a bottom, a suction cylinder adapted to grip and press down the front folded edge of said tube, and a suctionsl'ide adapted to press down the rear edge of the bottom part of said tube and to form said bottom into square shape, and means for applying a cover sheet onto the tube end shaped to form the bag bottom.

5. A method for mechanically making li'lllltlwall paper bags with cross bottoms, consisting in feeding webs ofpaper in a direction. transverse to the position of the side folds in the bags, severing the webs into sheets in such manner that the side edges of the severed sheets are stepped, superimposing and feeding the sheets to the subsequent operating stations at the same time preserving their stepped relatlon, in feeding a strip,

together with the said webs, and pasting the strip to one of the superimposed sheets at that transverse edge which corresponds to the mouth of the bag.

6. A method-for mechanically making multiwall paper bags with cross bottoms, consisting in feeding webs of paper in a direction transverse to the position of the side folds in the bags, severing the webs into sheets in such manner that the side edges of the severed sheets are stepped, superimposingand feeding the sheets to the subsequent operating stations at the same time preserving their stepped relation, in feeding a strip,

together with the said webs, in such position with\ respect to the superimposed sheets that it projects from that edge of the superimposed sheets which corresponds to the mouth of the bag, pasting the strip' to one of the superimposed sheets,

folding the strip down onto the sheets, and pasting its folded-down portion'to the other sheet.

'1. A method for mechanically making multiwall paper bags with cross bottoms, consisting in feeding webs of paper in a direction transverse to the position of the side folds in the bags, severing the webs into sheets in such manner that the side edges of the severed sheets are stepped, superimposing and feeding the sheets to the subsequent operating stations at the same time pre- I severing the webs into sheets in such manner arses-7e that the side of the severed sheets are stepped, superimposing and feeding the sheets to the subsequent operating stations at the same time preservingtheir stepped relation, in stepping the sheets also at their transverse edges,

feeding a wrapper sheet from a pile in the same direction in which the superimposed sheets are fed, and pasting the wrapper sheet to the superimposed sheets.

9. A method for mechanically making multiwall paper bags with cross bottoms,consisting in feeding webs of paper. in a direction transverse to the position of the side folds in the bags, severing the webs into sheets in such manner that the side edges of the severed sheets are stepped, superimposing and feeding the sheets to the subsequent operating stations at the same time preserving their stepped relation, in stepping the sheets also at their transverse edges, feeding a wrapper sheet from a pile in the same direction in which the superimposed sheets are fed, stepping the wrapper sheet with respect to the superimposed sheets at the side and at the transverse edges, and pasting thestepped wrapper sheet to the superimposed sheets.

MA?! GODER. 

